Strange problem with my colecovision

When smurfs is played player 1 jumps by itself with no controllers plugged in
it works normally in another colecovision and when playing donkeykong
I can go up the latter but cant go back down the ladder. Then player 2 can go only forward, cannot jump but does jump once without touching the controller and the blue player skill level select screen only shows for a split second. What can cause this?

It looks like there's a problem with a specific component inside the ColecoVision. See here for details on how to fix it: http://www.atariage....ost__p__2018922
Do it yourself or find a friend who can do it for the price of 2 beers, or contact Yurkie here at Atariage.
If you do some browsing in the ColecoVision forums here, you'll find this to be quite a common problem.